package filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest= (HttpServletRequest) servletRequest;
        HttpSession session=httpServletRequest.getSession();
        Object userName = session.getAttribute("userName");
        System.out.println(userName);
        if(null==userName) {
            servletRequest.getRequestDispatcher("index.jsp").forward(servletRequest, servletResponse);
        }

        filterChain.doFilter(servletRequest,servletResponse);

    }

    @Override
    public void destroy() {

    }
}
